Pedro..
Genuine rplacement.
My son took it back to Matty's Brake and Clutch, and they read down the codes for us.
No CAS but plenty of low voltage...Ther battery, and car don't go out much so very likely.
I had the charger on overnight for a full recharge, (I had a similar feel because the crank speed seemed a little low but not stalling at all) and it seems, today, hot starts are no issue...go figure.
Gonna have to drive it more, it must be feeling unloved